OpenBSC March 2024

openbsc@lists.osmocom.org

13 participants
13 discussions

Channel Requests not being responded when running CS-only 2G network

by JPichel

Hi, I am trying to setup a simple Network In The Box 2G network. I am only interested in CS capabilities (voice calls, SMS, USSD). I am currently running the following elements with the default configurations: - osmo-bts-trx (connecting to osmo-trx-uhd driving a USRP B205mini-i) - osmo-bsc - osmo-msc - osmo-hlr - osmo-mgw - osmo-stp I built all the programs from source on Ubuntu 22.04. Everything is running locally on one machine. Everything seems to function correctly at first, but I noticed that sometimes when I try to execute an USSD code or make a call, my Channel Requests are not being responded. I noticed when this happens, osmo-bts shows the following notice: DPCU notice PCU socket not connected, dropping message (pcu_sock.c:1018) As I understand from the documentation (https://osmocom.org/projects/cellular-infrastructure/wiki/Osmocom_Network_I…), this component is not required for circuit switched services as the ones I am requesting, so I do not understand why this is happening. I assume something in the configuration files is telling the BTS or some network element that the PS side of the network is active, but I haven't found anything related to PCU in any of configuration files.

2 weeks, 6 days

GSMTAP new version (3?)

by Mauro Levra

Dear Osmocom developers, In our project we have been using the gsmtap pseudo-header to store UMTS and LTE signalling traces in pcapng format. This is very efficient compared to our previous implementation based on DLT_USER, and thanks to the gsmtap dissector, it allows any *shark app to read our output file. When looking for the proper type and sub_type for NR signalling traces, I discovered they are not yet part of the standard. I found several threads of discussion about this, from about 2017 onwards, and I understand it is a matter of time and resources if the version 3 of GSMTAP has not been released. The most interesting feature I have read about is the ability to extend the header with a TLV approach. EARFCN, eNodeB-ID, PCI, are useful metadata we would like to add to our traces. In an ideal world, I would like things to be put in motion so that a new version of GSMTAP could see the light. More humbly, I ask you what kind of help is needed. Are you waiting for a draft specification? Are all requirements well known? I suppose that LTE and NR are not the main focus today for liboscmocore development, but there are many projects out there waiting for the GSMTAP format to be updated. Thanks! Mauro

3 weeks

DevCon: CSFB proposol / a general playground

by Keith

While I'm here looking at the mailing list, I have been thinking about asking about the following, and no need to delay it, I suppose - Upcoming OsmoDevCon attendees may have noticed the proposed and scheduled session on CSFB testing. Well, since - and sort of because that session was accepted, (and also an iPhone 6 that supports the band of an eNB I have at home dropped into my possession) - I've been prompted to advance my knowledge and understanding of issues, and the iPhone (6 at least) is now doing MO CSFB perfectly, and I think I see what some other observed issues are about. I'm still happy if there's interest to do the session of course, although maybe some might question whether it is more productive to just file tickets/issues and work them out the usual way. This email is not to suggest in any way to cancel the session, but rather to ask if maybe we might expand the scope. I'm thinking for example also testing 2G data. The older basic 2G + GPRS "chocolate bar" type phones I have don't work anymore, they used to. (not sure what one might actually do with such a device and GPRS these days, but that's not the point, right?) Someone (vadim?) brought a 2G (was it a credit card?) terminal once to devcon. Does it work? that kind of thing. So thinking about all this, I'm asking the question of whether there is interest to have a kind of events style setup during the conference. lynxis I think has a server for that, or maybe it's only a VM? I don't mean a distracting always-on setup, and I don't mean to put emphasis on cellular projects. But if we did want to have something multi RAT, available for anybody who might want to glance in that direction (during a USSE for example), then some (small) amount of logistics preparation is necessary, no? Thanks. k.

1 month

PyHSS / pyhss-tool

by Harald Welte

Hi all, While working with open5gs + kamailio, one traditionally always needed two HSS: * the open5gs one with its mongodb and nodejs hell * the FHoSS one for the kamailio IMS core For some time there's now PyHSS, which supports both EPS and IMS subscriptions, which is of course nice. docker_open5gs meanwhile also has switched to using it as default. The big problem is that it doesn't actually state which license it is under, which makes it legally impossible to [re]distribute it, or to even make a fork of the repository, as that would be a violation of copyright. At least German users are abel to legally use it, as under German copyright law you don't need a license from the copyright holder to use a program that you have obtained legally. In order to automatize the steps described in the open5gs_docker to create subscribers, I've just hacked up a small tool, see https://gitea.osmocom.org/laforge/pyhss-tool/src/branch/master/pyhss-tool.py Using that tool, it's as easy as pyhss-tool.py subscriber-create --imsi 001011111111111 --msisdn 1111 --k 000102030405060708090a0b0c0d0e0f --opc 00000000000000000000000000000000 or pyhss-tool.py subscriber-delete --imsi 001011111111111 to add/remove subscribers. You will still need to manually create the internet and ims APNs via the REST interface; I'll probably also add that capability to the tool. Once it's a bit more tested, I also would like to contribute it upstream, at least once that is possible. To do that I'd have to make a pull request, and making that pull request requires me to create a fork, which is a copyright violation. wtf. If that legal situation has cleared up, it might be worth considering either adding native GSUP support to PyHSS (so it can be used by osmo-{msc,sgsn}, or to have a converter like osmo_gsup2dia (the inverse of the existing osmo_dia2gsup). Regards, Harald -- - Harald Welte <laforge(a)osmocom.org> https://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)

1 month

Master NURS FPX 4000 Assessments with Expert Online Tutoring

by fortyquin93＠gmail.com

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1 month, 1 week

Excel in NURS FPX 4010 Assessments with Our Expert Online Tutoring

by williammores96＠gmail.com

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1 month, 1 week

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by williammores96＠gmail.com

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1 month, 1 week

Excel in NURS FPX 4010 Assessments with Our Expert Online Tutoring

by williammores96＠gmail.com

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1 month, 1 week

Re: OSMO-BSC, OSMO-PCU PCU & SGSN Ericsson

by jheyrendt.ext＠orange.com

Hi Many thanks Harald for you answer Yes, Ericsson SGSN MKX uses Classic mode (not ip-sns), and the osmo-pcu is configured with this line: gb-dialect classic. We took the time to check the SGSN, BSC & network configuration and all seems well configured. We continue to check and test but no way for now to correct this NS initialization step, and this error: NS_STATUS, Cause PROTOCOL ERROR - unspecified. So, if you have other ideas of what could be the problem, you're welcome. In addition, if you know someone who had set up this configuration, we would be very interested by he way of BSC and BTS, SGSN were configured. Best regards Jean-Marc Orange Restricted ____________________________________________________________________________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. This message and its attachments may contain confidential or privileged information that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and delete this message and its attachments. As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified. Thank you.

1 month, 2 weeks

OSMO-BSC, OSMO-PCU PCU & SGSN Ericsson

by jheyrendt.ext＠orange.com

Dear experts, We are trying to connect an osmocom platform to an Ericsson platform, and are trying to make funtional 2G. We use a VM for OSMO-BSC, a VM for OSMO-BTS-TRX + OSMO-PCU, and a Raspberry PI (trx-lms) Concerning the Gb, we connected the OSMO-PCU to an MKX Ericsson, and we have an error at the NS setup step. The communication between the SGSN Ericsson and the OSMO-PCU seems ok (IP / routing OK) We hope that the Ericsson MKX SGSN is well configured. We can see some packets: OSMO-PCU ---> SGSN : NS_RESET, Cause: P&M intervention, NS VCI: 0x1388, NSEI: 5000 and a response from the SGSN: NS_STATUS, Cause PROTOCOL ERROR - unspecified. What could be the problem ? timers ? ns-vci, nsvc 1, encapsulation,... Did someone test this: OSMOCOM with an ERICSSON SGSN ? One point is that the nsvci is only defined on the BSC (not on the SGSN) Many thanks in advance, Best regards Hoping that you could help us Jean-Marc ----------------------- BSC CONFIGURATION ----------------------- bts 0 type osmo-bts description LimeSDR Based BTS band GSM900 cell_identity 41023 location_area_code 390 base_station_id_code 63 ms max power 15 cell reselection hysteresis 4 rxlev access min 0 radio-link-timeout 32 channel allocator mode chan-req ascending channel allocator mode assignment ascending channel allocator mode handover ascending channel allocator mode vgcs-vbs ascending rach tx integer 9 rach max transmission 7 rach max-delay 63 channel-description attach 1 channel-description bs-pa-mfrms 5 channel-description bs-ag-blks-res 1 no nch-position no access-control-class-ramping early-classmark-sending forbidden early-classmark-sending-3g allowed ipa unit-id 901 0 oml ipa stream-id 255 line 0 neighbor-list mode automatic codec-support fr gprs ns timer tns-block 3 gprs ns timer tns-block-retries 3 gprs ns timer tns-reset 3 gprs ns timer tns-reset-retries 3 gprs ns timer tns-test 30 gprs ns timer tns-alive 3 gprs ns timer tns-alive-retries 10 gprs nsei 5000 gprs nsvc 0 nsvci 5000 gprs nsvc 0 local udp port 23001 gprs nsvc 0 remote ip 172.20.168.220 gprs nsvc 0 remote udp port 2157 ... ----------------------- PCU CONFIGURATION ----------------------- ns timer tns-block 3 timer tns-block-retries 3 timer tns-reset 3 timer tns-reset-retries 3 timer tns-test 30 timer tns-alive 3 timer tns-alive-retries 10 timer tsns-prov 3 timer tsns-size-retries 3 timer tsns-config-retries 3 timer tsns-procedures-retries 3 pcu flow-control-interval 10 cs 2 cs max 4 cs threshold 10 33 cs downgrade-threshold 200 cs link-quality-ranges cs1 6 cs2 5 8 cs3 7 13 cs4 12 mcs link-quality-ranges mcs1 6 mcs2 5 8 mcs3 7 13 mcs4 12 15 mcs5 14 17 mcs6 16 18 mcs7 17 20 mcs8 19 24 mcs9 23 mcs max 9 window-size 64 0 queue idle-ack-delay 10 queue codel

1 month, 2 weeks

cmd2 update causing pySim-shell to fail

by bryan coxwell

Hi all, Just wanted to share an issue and a quick workaround I found for it in case anyone else has the same problem. I believe a cmd2 update is causing pySim-shell to fail. After installing it on a fresh install of Ubuntu Server 20.04 and getting the following error when I run "python3 pySim-shell -p0": >Using PC/SC reader interface >Autodetected card type: sysmoUSIM-SJS1 >AIDs on card: > USIM: a0000000871002ffffffff8907090000 >Traceback (most recent call last): > File "pySim-shell.py", line 512, in <module> > app = PysimApp(card, rs, opts.script) > File "pySim-shell.py", line 59, in __init__ > super().__init__(persistent_history_file='~/.pysim_shell_history', allow_cli_args=False, use_ipython=True, auto_load_commands=False, command_sets=basic_commands, >startup_script=script) >TypeError: __init__() got an unexpected keyword argument 'use_ipython' If you run into this you can fix it by uninstalling cmd2 and reinstalling cmd2 with "pip3 install cmd2==1.5". Best, Bryan

1 month, 3 weeks

[wireshark] GSMTAP: check version field

by Mauro Levra

Hello everyone, Could any of you please review the merge request "GSMTAP: check version field" [1]? The purpose is to check the content of the 'version' field in gsmtap header and act in case of unknown versions. Cheers, Mauro [1] https://gitlab.com/wireshark/wireshark/-/merge_requests/14623

1 month, 3 weeks

pycrate repo update

by benoit michau

Dear osmocom developpers, This is just to let you know that the Python library pycrate has a new home : https://github.com/pycrate-org/pycrate. The packages on Pypi are now feeded from there. This library can be used in many cases dealing with mobile signalling. I wanted to let you know, as even if I am not aware of any osmocom projects depending on it, some of you may use the library from time to time, or could have local applications depending on it. Best Regards Benoit

1 month, 3 weeks

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